Steam-boiler



.(No Model.) 2 Sheets-Sheet 1.

E. G. DURANT, A. D. LINN 8a A. SHUPB. STEAM BOILER.

No. 365,173. PatsntedJune 21, 1887.

{/7 I i 411: 0. Luv/v may wjwi (No Model.) 2 Sheets-Shet 2. E. G.DURANT, A. D. LINN & A. SHUPE.

STEAM BOILER.

[DI/YARD G. Dual/ r Patented June 21, 1887',

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welded or otherwise secured therein.

UNITED STA'irEs ATENT EDIVARD G. DUltANT, ALLEN D. LINN, AND AARONSIIUPE, OF RACINE, VISCONSIN, ASSIGNORS TO THOMAS KANE, OF CHICAGO,ILLINOIS,

AND THE RACINE RACINE, IVISCONSIN.

HARD\VARE MANUFACTURING COMPANY, OF

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 865,173, dated June 21,1887.

Application filed May 22, 1896.

To all whom it may concern:

Be it known that we, EDlVARD G. DURANT, ALLEN D. LINN, and Aaron SnUrE,of Racine, in the county of Racine and State of IVisconsiu, haveinvented certain Improvements in Steam-Boilers, of which the followingis a specification.

The aims of the present invention are mainly to secure a great extent ofheating-surface in proportion to the space occupied by the boiler;

to render the boiler practically non-explosive;.

to secure a thorough circulation of the water therein; to preventthedeposition of sediment, and to afford convenient access to the internalparts at all times.

In the accompanying drawings, Figure 1 represents a vertical centralcross-section of our boiler; Fig. 2, a horizontal section of the same onthe line at a",- Fig. 3, a horizontal sec tion on the line 1 3 Inconstructing our boiler we first provide a cylinder, A, with both endssealed or closed. This is preferably formed of a section of wrought-ironpipe having two ends or heads Into this pipe, which forms the body ofthe boiler proper, wcscrew a series of radial wrou ght-iron tubes, 13,the outer ends of which are closed by caps screwed thereon, orotherwise, as may be preferred.

\Vithin the body A we place a reservoir, C, of tubular form, having itsupper end open and its lower end closed. This reservoir is fixedcentrally within the body, a suitable space being left between it andthe interior of the body, both at their lower ends and at thecircumference, so that the water may circulate freely around and beneaththe reservoir. Into the reservoir we screw firmly the inner ends of aseries of pipes, D, which extend outward within the pipes B, terminatingat the distance of an inch (more or less) from the outer ends of thelatter. These smaller pipes are open at both ends. The reservoir Cextends slightly above the water-line of the boiler, and the feed-wateris introduced directly thereto, preferably at the base, through a pipe,E. The water entering the reservoir C through this pipe passes out-wardthrough the pipes D to the outer ends of the pipes B, in which it islargely converted to steam, and through which it returns around theexterior of the pipe D into the body A, the'ehanging temperature of thewater resulting in a rapid and uniform circulation.

It will be observed that the body A is pro vided with tubes 13 above thelevel of the reservoir and above the water-line. These tubes act assuperheaters for the steam generated in the lower part of the apparatus.The lowermost tubes, B, are seated at their ends upon and sustained byan annular base-plate, F, flanged and bolted to the upper edge of acylindrical iireehamber, G, having a lining, I, of asbestns or likerefractory material. This fire-chamber may be provided with a firegrateor with a gas-burner, J, of the form shown in the drawings, or of anyother equivalent form. Vhen this burner is employed, the fire-chamber isprovided at its base with a series of air-inlet openings, K, and with aseries of internal studs or lips, L, which support a plate, M, lyingabove the air-inlets and provided with a central opening, as shown inFig. 1, the construction being such that the air entering at thecircumference is compelled to pass beneath the plate M to the centralopening, through which it ascends to the tirechamber, being delivereddirectly to the burner. The fire-chamber is provided immediately belowthe central air opening with a receptacle containing a mass of freeasbestns, N, orlike absorbent material, to receive oil, alcohol, or likematerial, to serve as a torch to inaugurate the action of the burner.

The body of the boiler is surrounded by a shell or casing, 0, consistingof two cylindrical sheet-metal shells seated at their lower ends againstannular flanges on the base-plate F, and having between them anair-space to prevent loss of heat by radiation. The sheet metal shellsare seated at their upper ends within a flanged ring, 1?, the upperedges of which are adapted to receive the lower edges of two shcet metalcones, forming the top of the casing. The ring I is held in place on andsafety-valve.

top of the casing and the latter held in place on the base-plate bymeans of vertical rods Q, arranged as shown.

Outside of the casing we arrange a vertical tube, R, having its upperand lower ends provided with caps, or otherwise closed, and connected atthe upper end by a pipe, S, to the top of the steam-space of the body A,and at the lower end by a pipe, l, to the-lower end of the reservoir 0,or body A, this arrangement causing the water in the tube to stand atthe same level as that in the boiler, and also aiding to some extent toequalize the pressures in the boiler and preventinterruption of thecirculation. To the external tube, R, we apply the usual water-gage,gage-cocks, pressure-gage,

The feed-pipe E is preferably fashioned into a coil, located in thefirechamber immediately overthe burner, as represented in the drawings,or below it, in .order that the feed-water may be delivered into thereservoir Q at a temperature near the boilingpoint;

We are aware that boilers consisting of an upright body provided withradiating watertubes are very old in the art, and that outer bodieshaving radial tubes have been combined with inner bodies having smallertubes extend ing outward within the main tubes; but our boiler differsfrom itspredecessors, among other I important particulars, first, inhaving the inner body terminated and closed above the base of the outerbody, so that a water-space is provided between them at the base;second, in having the open top of the inner body extended above thewater-line, thusinsuring and improving the circulation; and, third, inhaving the feed-water introduced directly into the central body, so thatits passage through the tubes and over a very extendedheating-surface-is secured.

Having thus described our invention, what weclaim is- 1. In a steamboiler, the combination of a fire-chamber, a body, A, provided withradiating tubes B, closed at their outer end, said body having its baseand its tubes closed directly over the fire-chamber, the centralreservoir having an open upper end and a closed lower end, and thelatter elevated above the base of the body,that the water may circulatebetween them, and the tubes D, extending from the reservoir outwardwithin tubes 13, and open at the outer end.

2. In a steam-boiler, a body, A, having a series of radial pipes closedat their outer ends,

in combination with an internal reservoir, 0, open at its top and closedat its bottom, said open top extended above the water-lineof the boiler,pipes D, leading from said reservoir ends, a stand-pipe, R, and pipesconnecting said stand-pipe at its lower end with the waterspace and atits upper end with the steamspace of the'boiler. I

4. In a steam-boiler, the combination of a body, A, a reservoir, 0,located therein, its upper end being open and its lower end closed, anda stand-pipe, R, having its lower end connected with the lower part ofthe central reservoir and its upper end connected with the steam-spaceof the boiler. I 5. In a steam-boiler, the combination of the body andits radial arms, the fire-chamber thereunder, provided with air-inletsat the circumference, the plate M, provided with a cen- H tralopening'and located above the air-inlets, as described, and a burner,J,'located above said plate.

' 6. In a steam-boiler, the fire-chamber provided with studs orprojections L and with circumferential air-inlets K, in combination withthe plate M, having the central air-passage, and a burner, J, locateddirectly over said air-inlet.

In testimony whereof we hereunto set our hands, this 18th day of May,1886, in the presence of two attesting witnesses.

'EDVVARD G. DURANT.

ALLEN D. LINN. AARON SHUPE.

VVitnessc's:

WV. It. ALLEN, J. F. BIcKEL.

